EP3263903B1 - Oilless compressor - Google Patents
Oilless compressor Download PDFInfo
- Publication number
- EP3263903B1 EP3263903B1 EP16755229.8A EP16755229A EP3263903B1 EP 3263903 B1 EP3263903 B1 EP 3263903B1 EP 16755229 A EP16755229 A EP 16755229A EP 3263903 B1 EP3263903 B1 EP 3263903B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lubricating oil
- cooling jacket
- compressor
- piping
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000010687 lubricating oil Substances 0.000 claims description 110
- 238000001816 cooling Methods 0.000 claims description 93
- 239000003921 oil Substances 0.000 claims description 66
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000006835 compression Effects 0.000 description 12
- 238000007906 compression Methods 0.000 description 12
- 238000005461 lubrication Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 230000005484 gravity Effects 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 230000002000 scavenging effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000005192 partition Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/10—Fluid working
- F04C2210/1005—Air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/20—Fluid liquid, i.e. incompressible
- F04C2210/206—Oil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/30—Casings or housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/40—Electric motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/806—Pipes for fluids; Fittings therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/24—Level of liquid, e.g. lubricant or cooling liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
- F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/025—Lubrication; Lubricant separation using a lubricant pump
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Compressor (AREA)
Description
- The present invention pertains to an oilless compressor, and relates to an oilless compressor including a lubricating oil system that performs lubricating a machine element in the compressor, cooling a power source for driving the machine element, and so on.
- As an air compressor, which is one of typical types of compressors, there are some types, such as an oil-feed type which is configured to inject oil into a compression operation chamber, an oilless type which does not inject oil. Furthermore, the oilless type air compressors also have some types such as a water-injection type and a dry type one; the water-injection type injects water, and the dry type does not. Hereinafter, an oilless type air compressor, including a water-injection type and a dry type one, may be referred to as an oilless compressor.
- Although an oilless compressor does not feed oil into a compression operation chamber, it is generally necessary to feed with oil for lubrication into some parts located outside of the compression operation chamber, i.e., a bearing, a drive gear for transmitting power from a power source such as an electric motor, and a timing gear used in, for example, a screw compressor having two or more rotors. Furthermore, in a dry type oilless compressor, a compressor body has a high temperature because of adiabatic compression; therefore, for example, in order to suppress thermal deformation of a housing of the compressor body, there are some dry type oilless compressors that are provided with a cooling jacket around a compression chamber, thus cooling the compression chamber with liquid such as water, coolant, oil or so.
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Patent Literature 1 discloses an example of the structure of a lubricating oil system of an oilless compressor. The oilless compressor disclosed inPatent Literature 1 is a screw compressor having female and male rotors, and it is structured to use a gear casing (at the lower part thereof) as an oil sump; the gear casing houses a gear connecting a male rotor shaft, which is a driven shaft, and a drive shaft that drives the male rotor shaft. - The gear casing has a function of accumulating the amount of oil necessary for circulation, and, in addition, is provided with an atmospheric communicating tube for letting the internal pressure escape, thus dropping the pressure toward about the same as the atmospheric pressure when it has become excessively high within the casing. Furthermore, as a structure for communication between the air part in the gear casing and the air part in an ending cover of the compressor, it is structured to equalize the internal pressure between the ending cover and the gear casing.
- The screw compressor disclosed in
Patent Literature 1 is structured to use the gear casing as an oil sump, thereby making it possible to accumulate the amount of oil needed to be fed to a compressor body, and also to maintain the internal pressure of the gear casing at about the same as the atmospheric pressure, so that the drainage of oil from the compressor body can be performed smoothly, and the circulation and feeding of lubricating oil to machine elements such as bearings and timing gears of the compressor body can be performed properly. - Furthermore,
Patent Literature -
- PATENT LITERATURE 1:
JP H8-284863 A - PATENT LITERATURE 2:
DE 197 45 616 A - PATENT LITERATURE 3:
US 5 263 832 A - Here, with respect to cooling of a drive source for driving a compressor body, for example, electric motors may be used as a drive source; most of them are an air-cooled type. An air-cooled electric motor may be inferior in cooling capacity as compared with a liquid-cooled electric motor. To compensate for this, if a big radiating fin is provided on the outer circumference of a housing of a compressor, or if the size or rotation speed of a cooling fan for generating cooling air is increased, which makes the size of the compressor or the energy consumption increased.
- On the other hand, a liquid-cooled electric motor is superior in cooling performance; however, a dedicated refrigerant for a compressor and a path for the refrigerant are provided in general, which causes the increasing size or the complicated configuration of the compressor. In particular, given that room for an oil sump is secured in a gear casing, the size of the compressor is increased further, or the configuration of the compressor is complicated further.
- Furthermore, a gear casing is the area where driving force from an electric-motor-side shaft is transmitted to a compressor-side drive shaft, and therefore, the area of the gear casing is preferably as small as possible in consideration of mechanical loss; however, the reduction of this area may be limited due to a constraint to secure room for an oil sump.
- There is expected a configuration enabling to efficiently achieve the miniaturization of a compressor and the cooling of an electric motor.
- To solve the above-described problems, for example, a configuration described in the claims is employed. Specifically, the configuration is an oilless compressor having the features of
independent claim 1. Preferred embodiments are described in the dependent claims. - According to the present invention, it is possible to efficiently achieve the miniaturization of a compressor and the improvement in coolability of an electric motor, and also possible to make the securing of assemblability and the aspect of cost more efficient.
-
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FIG. 1 is a schematic diagram showing a longitudinal cross-sectional side view and a horizontal cross-sectional top view of an oilless screw compressor according toEmbodiment 1 applied with the present invention. -
FIG. 2 is a schematic diagram showing a horizontal cross-sectional top view of an oilless screw compressor according toEmbodiment 2. -
FIG. 3 is a schematic diagram showing a longitudinal cross-sectional side view of an oilless screw compressor according toEmbodiment 3. -
FIG. 4 is a schematic diagram showing a longitudinal cross-sectional side view of an oilless screw compressor according to Embodiment 4 and an external configuration of the oilless screw compressor when viewed from the side of a compressor body in a direction of the rotation axis. -
FIG. 5 is a schematic diagram showing a longitudinal cross-sectional side view of an oilless screw compressor according to Embodiment 5 and a schematic diagram showing a cross-section of an electric motor. -
FIG. 6 is a schematic diagram showing a schematic configuration of an oilless screw compressor component according toEmbodiment 2. - Embodiments of the present invention are described below with drawings.
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FIG. 1 shows a cross-sectional configuration of an oilless compressor according toEmbodiment 1 applied with the present invention (hereinafter, referred to as "compressor 101"). Here,FIG. 1(a) is a longitudinal cross-sectional side view, andFIG. 1(b) is a horizontal cross-sectional top view. Incidentally, inFIG. 1(b) , description of some parts of lubricating oil piping system (35a to 35e, 37b to 37e) or the like, shown inFIG. 1(a) is omitted. - The
compressor 101 includes acompressor body 1, anelectric motor 2, and agear casing 3; thecompressor body 1 and theelectric motor 2 are axially arranged through thegear casing 3. Thecompressor body 1 includes a pair of male andfemale screw rotors compression operation chamber 22 from anair inlet 20 through an air filter (not shown) and ejecting compressed air from anoutlet 21. In the present embodiment, the compressor is described as an oilless compressor that does not inject liquid for cooling, lubrication, sealing, etc. into a compression operation chamber; however, it can be a water-feed type compressor. Furthermore, the present embodiment can be applied to even an oil-feed type compressor, for example, if it has separate systems for oil fed into a compression operation chamber and oil for lubricating machine elements such as gears and bearings. - On the ejection side of
rotor shafts 31 of each of themale rotor 30a and thefemale rotor 30b, a non-contact or a contact compressorbody shaft seal 1s composed of an air sealing, a screw sealing, etc. is installed to prevent the escape of compressed air from theoperation chamber 22 to the gear side and, also to prevent the lubricating oil leak from the gear side to theoperation chamber 22 side. One ormore bearings 1b are installed on the further side of the compressor body shaft seal Is, andtiming gears male rotor 30a and thefemale rotor 30b respectively, are installed at the distal ends of therotor shafts 31; themale rotor 30a is driven by driving force from theelectric motor 2, thereby the male and female rotors rotate in a direction of engaging with each other with a gap between them. - A
shaft seal 1s composed of a non-contact or a contact air sealing and screw sealing, etc. is installed on thegear casing 3 side of eachrotor shaft 31 as well, and beyond theshaft seal 1s, one ormore bearings 1b are installed on the side of theelectric motor 2. Then, a drivengear 4b is fixed to the gear-casing 3 side end of therotor shaft 31 of themale rotor 30a, and is engaged with adrive gear 4a fixed to amotor shaft 32, thereby driving force of theelectric motor 2 is transmitted to themale rotor 30a. - The
gear casing 3 covers thedrive gear 4a, the drivengear 4b, thebearings 1b of thecompressor body 1, etc. and also has a function as a flange for connecting thecompressor body 1 and theelectric motor 2. Furthermore, one of the characteristics of the present embodiment is that a space serving as an oil sump is not particularly provided in the lower internal space of thegear casing 3, thereby reducing the size of thegear casing 3. - The
electric motor 2 is a radial gap magnet motor having a rotator and a stator. Incidentally, various types of motors, such as an induction motor and an axial gap type one, can be applied. Theelectric motor 2 includes a substantiallycylindrical motor housing 2c, one open end thereof in a direction of the rotation axis is formed to have about the same diameter as the outer diameter of the electric-motor-2-side open end of thegear casing 3, and these open ends are connected to each other. - In the
motor shaft 32, ashaft seal 2s and abearing 2b are installed on the side of thegear casing 3. Theshaft seal 2s is a non-contact or a contact air sealing and screw sealing, and prevents lubricating oil from leaking from thegear casing 3 side to inside theelectric motor 2. Likewise, abearing 2b is installed at the opposite-output-side end of themotor shaft 32 as well. - The
motor housing 2c is configured to have a double-layered structure almost over the entire circumference of the inner cylinder, and the space formed by such structure is used as acooling jacket 2j for cooling (for example, armatures, such as a stator and a rotator) of theelectric motor 2. Specifically, lubricating oil for lubricating various gears installed in thegear casing 3 and on the ejection side of thecompressor body 1 is circulated into thecooling jacket 2j, and the lubricating oil is also used for cooling of theelectric motor 2. - Furthermore, the
motor housing 2c is provided with anoil inlet 39, which is a return port of lubricating oil circulated back on the bottom thereof, and is also provided with anoutlet 49 through which lubricating oil is discharged toward a lubricating oil system on top thereof. By this configuration, thecompressor 101 can use thecooling jacket 2j as an oil sump without particularly providing an internal space to be used as an oil sump in thegear casing 3. - Incidentally, the cooling
jacket 2j can be configured to cover only a circumferential direction of theelectric motor 2 or also including the bracket side on the opposite output shaft side, or can be configured to be partially installed in the circumferential direction. - Subsequently, the lubricating oil system of the
compressor 101 is described. - A
piping 35a is connected to theoutlet 49 of thecooling jacket 2j, and thepiping 35a branches intopipings compressor body 1 side and apiping 35e for feeding lubricating oil to the opposite-output-side end of theelectric motor 2. Thegear casing 3 and a housing of thecompressor body 1 are each provided with an oil feed path that runs through from top to inside the apparatus and through which lubricating oil is guided to various gears and bearings; thepipings compressor housing 2 is also provided with a lubrication path through which lubricating oil is guided to thebearing 2b, and thepiping 35e is connected to the path. - Furthermore, on the bottoms of the
compressor body 1, thegear casing 3, and the opposite-output-side bracket of themotor housing 2c, an outlet of lubricating oil is formed;pipings pipings piping 37a connected to an inlet of anoil pump 6, and lubricating oil is circulated back to theoil inlet 39 of thecooling jacket 2j by theoil pump 6. - The
oil pump 6 is a pump driven by electricity or mechanical driving force, and can control the amount of lubricating oil to be pumped according to, for example, the number of rotations of thecompressor body 1. In the present embodiment, an electromagnetic pump shall be applied; the electromagnetic pump performs variable speed control enabling to appropriately adjust the amount of lubricating oil to be pumped according to a control signal from a control device (not shown) on the basis of the number of rotations of thecompressor body 1, the pressure of ejected air, the temperature of lubricating oil, etc. - In this way, according to
Embodiment 1, both the lubrication of machine elements such as gears, bearings of thecompressor 101 or so and the cooling of theelectric motor 2 can be performed with the same lubricating oil. Especially in an oilless screw compressor with rotors having high-speed rotation and high temperature, without causing a complicated configuration and a massive increase in the number of parts, an electric motor can be liquid-cooled with a simple configuration, and it is possible to expect an effect of sufficiently cooling theelectric motor 2. - Furthermore, the cooling
jacket 2j doubles as an oil sump, and therefore, the miniaturization and the simplified configuration of thegear casing 3 can be achieved, and it can be said that this makes the whole volume of thecompressor 101 further reduced. - An oilless screw compressor according to Embodiment 2 (hereinafter, referred to as "
compressor 102") is described. One of the characteristics of thecompressor 102 according to theEmbodiment 2 is that thecompressor 102 further includes a cooling jacket 1j in a housing of thecompressor body 1, as compared with thecompressor 101 inEmbodiment 1, and lubricating oil is then circulated into the cooling jacket 1j to cool thecompressor body 1 as well. -
FIG. 2(a) shows a horizontal cross-sectional view of thecompressor 102. Incidentally, in the following description, the same member as that inEmbodiment 1 shall be assigned the same reference numeral, and detailed description of the member is omitted. - The
compressor body 1 is configured to have a double-layered structure, just like themotor housing 2c, to make the cooling jacket 1j on the outer circumference of the body housing lubricating oil fed from theoutlet 49 of thecooling jacket 2j to thepiping 35a by driving of theoil pump 6 is fed to the cooling jacket 1j through apiping 35f branched from thepiping 35a. - The
piping 35f is connected to the cooling jacket 1j from top of thecompressor body 1 or the electric motor 2 (inFIG. 2(a) , an arrow from the side indicates the installment from the upper side to the lower side), just like theother pipings piping 37f connected to thepiping 37a is connected to the lower side of the cooling jacket 1j, and lubricating oil is configured to be collected at theoil pump 6. - In the middle of the
piping 35f, both an air or liquid-coolingoil cooler 11 as lubricating oil cooling way and atemperature control valve 12 for controlling the flow of lubricating oil from thepiping 35f into theoil cooler 11 are provided. Thetemperature control valve 12 is configured to open a path to theoil cooler 11 side when the oil temperature has reached a predetermined temperature zone. Incidentally, the path of thetemperature control valve 12 can be configured to be switched upon receipt of a signal from a control device (not shown) based on not only the oil temperature but the pressure and temperature of ejected air, the number of rotations of the electric motor, the temperature of inside the electric motor, etc. - In this way, according to
Embodiment 2, lubricating oil can be further used as cooling of thecompressor body 1. Especially in an oilless screw compressor having high-speed rotation and high temperature, the lubrication of gears and bearings and the cooling of thecompressor body 1 and theelectric motor 2 can be performed with a simple configuration. - Furthermore, in
Embodiment 2, after lubricating oil is cooled by theoil cooler 11, the lubricating oil can be circulated to thecompressor body 1 side; therefore, even at the time of high-speed rotation and high temperature, as for the lubrication of gears, etc., the appropriate lubricant viscosity can be ensured, and the coolability of thecompressor body 1 can also be ensured. - Incidentally, in the example of
FIG. 2 , thepipings piping 35f, which is a pipeline to the cooling jacket 1j, are parallel paths; however, as shown inFIG. 2(b) , these can be series paths so that lubricating oil is circulated to the machine element lubrication paths (35b, 35c, 35d) after circulated into the cooling jacket 1j. - An oilless screw compressor according to Embodiment 3 (hereinafter, referred to as "
compressor 103") is described.Embodiment 3 is similar to thecompressor 101 inEmbodiment 1, and yet differs particularly in that themotor shaft 32 and therotor shaft 31 of themale rotor 30a are configured to be connected directly, and thedrive gear 4a and the drivengear 4b are not provided for driving transmission between these shafts. -
FIG. 3 shows a longitudinal cross-sectional side view of thecompressor 103. In thecompressor 103, themotor shaft 32 and therotor shaft 31 are configured to be connected directly by fitting or shrinkage fitting, or integral molding; therefore, the size of thegear casing 3 can be reduced further. Furthermore, the coolingjacket 2j doubles as an oil sump, and therefore, the miniaturization of thegear casing 3 can be promoted further, and it is possible to achieve the miniaturization/compactification of theentire compressor 103. - Here, the outer diameter of the
electric motor 2 generally tends to be larger than the outer diameter of thecompressor body 1. Specifically, thecompressor 103 has thecooling jacket 2j in themotor housing 2c, thus the outer diameter of theelectric motor 2 tends to be further larger. If thecompressor 103 is set so that themotor shaft 32 is horizontally installed (transversely placed), the level of lubricating oil in thecooling jacket 2j becomes higher than those of parts to be lubricated, such as thebearings oil pump 6 is obtained, such as when thecompressor 103 is at a stop, such a level difference from lubricating oil may possibly cause the lubricating oil to flow backward from theoil inlet 39 to a gear chamber or the like of thecompressor body 1, etc. through thepipings compression operation chamber 22 or a drag at the time of start up, and it can be said that this becomes a major problem especially for an oilless compressor. - Accordingly, the
compressor 103 includes acheck valve 7 on thepiping 37a on the upstream of theoil pump 6. Thecheck valve 7 allows only the flow from thepipings oil pump 6, and prevents the backward flow from the coolingjacket 2j to thepipings - In this way, according to
Embodiment 3, the coolingjacket 2j serves as an oil sump, which contributes maximally to the advantages of the miniaturization of thegear casing 3 when themotor shaft 32 and therotor shaft 31 of themale rotor 30a are configured to be connected directly. - Furthermore, to cope with an event that the level of lubricating oil in the
cooling jacket 2j becomes higher than those of parts to be lubricated, thecheck valve 7 is installed, thereby the backward flow of lubricating oil to thecompressor body 1 side can be prevented. - Embodiment 4 is described. One of the characteristics of an oilless screw compressor in Embodiment 4 (hereinafter, referred to as "
compressor 104") is that anatmosphere communicating part 8 communicated with outside air is provided on top of thecooling jacket 2j. Furthermore, thecompressor 104 includes an internal piping 9 through which lubricating oil is fed to thebearings 1b installed between themale rotor 30a and theelectric motor 2. Moreover, Embodiment 4 differs from the other embodiments in that the installation positions of thepipings jacket 2j to objects to be lubricated are lower than the level of oil in thecooling jacket 2j. -
FIG. 4 shows a longitudinal cross-sectional side view of thecompressor 104. Incidentally, thecompressor 104 is based on the configuration of thecompressor 103 inEmbodiment 3. The same member as that inEmbodiment 3 is assigned the same reference numeral, and detailed description of the member is omitted. - The
atmosphere communicating part 8 is composed of a hole or a tube provided on themotor housing 2c. Theatmosphere communicating part 8 is provided on a portion of themotor housing 2 that is the upper part of themotor housing 2 and is located above the highest level of lubricating oil in thecooling jacket 2j. A circulation system of lubricating oil is a substantially enclosed space; therefore, if there is noatmosphere communicating part 8, lubricating oil is circulated depending on the feeding pressure of theoil pump 6. On the other hand, by providing theatmosphere communicating part 8 enabling the introduction of outside air, lubricating oil can have natural circulation (i.e., free fall due to gravity) according to the difference of elevation between systems. - The internal piping 9 is a lubricating oil flow path formed on the
motor housing 2c or the housing of thegear casing 3. The internal piping 9 is a flow path through which lubricating oil is fed from the coolingjacket 2j to thebearings 1b installed between thecompressor body 1 and theelectric motor 2. An opening of the internal piping 9 on the side of thecooling jacket 2j is located in a position lower than the oil level. Accordingly, when the oil level is located above the opening, lubricating oil is fed to thebearings 1b by free fall. - Furthermore, the
pipings bearings 1b and the timing gears 5a and 5b installed on the ejection side of thecompressor body 1, thepiping 35e which is a lubricating oil path to thebearing 2b installed on the side of the opposite-output-shaft end of theelectric motor 2, and thepiping 35a which is the upstream of these pipings are installed at positions lower than the level of lubricating oil in thecooling jacket 2j (on the side of the side surface of the compressor 104) (inFIG. 4(a) , each piping indicated by a dashed line shows that the piping is located in a "lower position."). An installation relationship of thesepipings FIG. 4(b) . -
FIG. 4(b) schematically shows an external elevation of thecompressor 104 when viewed from thecompressor body 1 in a direction of the rotation axis. As shown inFIG. 4(b) , thepiping 35a is provided with an opening at the level that is on the outer circumference of themotor housing 2c lower than the position of the oil level of lubricating oil (a dot-and-dash line) and is around the position in a horizontal direction corresponding to the shaft center of therotor shaft 31 or the like. Likewise, thepipings pipings piping 35e (not shown) is also provided with an opening in the same level range. - As the opening positions of the pipings are lower than that of the oil level in the
cooling jacket 2j, circulation of lubricating oil by gravity fall can be expected. Furthermore, as the opening positions of thepipings side bearings 1b installed on the outer circumference of therotor shaft 31, etc. and thebearing 2b of the opposite-output-shaft end. Incidentally, it can be said that the opening positions are preferably slightly above an extension of the shaft center in the horizontal direction. - As described above, according to Embodiment 4, it enables certain feeding of lubricating oil by gravity fall, and expands the flexibility in the piping configuration of lubricating oil.
- Furthermore, by adjusting especially the level of the opening position of the
piping 35a, it is possible to limit the amount of lubricating oil fed when the oil pump is at a stop. - Moreover, gravity fall is used in feeding of lubricating oil to the gears, etc.; thus, it can be said that the
oil pump 6 only has to feed the predetermined amount of lubricating oil to thecooling jacket 2j. Therefore, there is no need to actively generate feeding pressure to the pipings, which makes it possible to achieve the reduction in energy and the miniaturization of the pump. - Incidentally, the
atmosphere communicating part 8 can be obviously set as a lubricating oil replenishing port. - Embodiment 5 is described. One of the characteristics of an oilless screw compressor in Embodiment 5 (hereinafter, referred to as "
compressor 105") is that the internal space of thecooling jacket 2j of theelectric motor 2 is divided into two upper and lower parts, and theoil pump 6 is driven with driving force of theelectric motor 2 that is a drive source of thecompressor body 1. -
FIG. 5(a) shows a longitudinal cross-sectional side view of thecompressor 105. Incidentally, thecompressor 105 is based on the configuration of thecompressor 104 in Embodiment 4; the same member is assigned the same reference numeral, and detailed description of the member is omitted. - The
compressor 105 includes an oil pump 6B at an opposite-output-shaft end of themotor shaft 32; the oil pump 6B obtains a force for feeding lubricating oil by corotation. Furthermore, the internal space of thecooling jacket 2j is configured to be divided into an upperfirst space 40 and a lowersecond space 41. -
FIG. 5(b) schematically shows a cross-section of theelectric motor 2 viewed from the axial direction. The coolingjacket 2j is provided withpartitions 45 on either side of the inside of thecooling jacket 2j along an extending direction of theshaft 32 in accordance with a horizontal line passing through the shaft center of themotor shaft 32, thereby forming thefirst space 40 on the upper side and thesecond space 41 on the lower side. - Incidentally, in the present embodiment, the internal space of the
cooling jacket 2j is configured to be divided into two equal upper and lower parts: the first and second spaces by a horizontal line passing through the shaft center of themotor shaft 32; however, the division position can be configured to shift downward. That is, as will be described later, lubricating oil after having been used to lubricate the gears, etc. is circulated back to thesecond space 41 by gravity; however, the amount of lubricating oil discharged from thecompressor body 1 and thegear casing 3 may sometimes be less than the capacity of thesecond space 41. In this case, the oil level in thesecond space 41 is substantially lower than the shaft center, an area where lubricating oil is not circulated around is generated on the upper side of the second space, and there may exist a part not suited for cooling of theelectric motor 2. Accordingly, to secure the capacity appropriate for the amount of lubricating oil discharged from thecompressor body 1, etc., the division position of thecooling jacket 2j can be set in a lower position (for example, such as indicated by a dot-and-dash line inFIG. 5(b) ). - To return to
FIG. 5(a) , lubricating oil fed from thefirst space 40 to the gears and the bearings through pipings such as thepiping 35a is eventually circulated back to thesecond space 41 through pipings such as thepiping 37a. The oil pump 6B is installed in the middle ofpipings second space 41 and thefirst space 40, and is configured to feed lubricating oil of thesecond space 41 to thefirst space 40. - Furthermore, pipings such as the
piping 35a through which lubricating oil is fed to the gears and the bearings are configured to use gravity fall of lubricating oil as with Embodiment 4. Moreover, thesecond space 41 is located in a position lower than the timing gears 5a and 5b and thebearings second space 41. Therefore, the discharged lubricating oil is spontaneously circulated back to thesecond space 41 located in the lower position by gravity. - In this way, according to Embodiment 5, in addition to liquid cooling of the
electric motor 2, by forming thesecond space 41 in which the oil level is lower than the gears and bearings to be lubricated, the natural backward flow of lubricating oil can be achieved on a discharge path of the lubricating oil after lubrication as well and the simplified configuration can be achieved. - Furthermore, by appropriately adjusting the vertical installation positions of the
partitions 45, it is possible to prevent an area partially not filled with lubricating oil from being generated in thesecond space 41 of thecooling jacket 2j, and is possible to ensure cooling of theelectric motor 2. - Moreover, the
oil pump 6 is modified into the self-excited oil pump 6B and is configured to be integral with the opposite-output-side bracket of themotor housing 2c, thereby it is possible to achieve the miniaturization/compactification of the configuration of theentire compressor 105, and is possible to reduce energy for lubrication of machine elements and cooling of theelectric motor 2. -
Embodiment 6 is described.Embodiment 6 is an example whereEmbodiments 1 to 5 are configured as acompressor component 50. -
FIG. 6 schematically shows a configuration of the compressor component. Incidentally, for convenience of description, thecompressor 103 inEmbodiment 3 is taken as an example. - The
compressor component 50 includes abase 51, apackage panel 52 composed of a combination of multiple metallic plates, aleg part 53 for installing thecompressor 103 on thebase 51, anair cooler 54, afan 55, afan motor 56, acontrol device 60, etc. Thecompressor 103 is fixed to thebase 51, and theleg part 53 extending in a vertical direction is connected and fixed to part of the housing of thecompressor body 1, themotor housing 2c, or the like through vibration-proof material or the like composed of an elastic body such as rubber, and is horizontally installed (transversely placed) with the direction of the rotation axis as a horizontal direction. - The
package panel 52 is provided with anair inlet 57 from which outside air is introduced into the component on the lower side thereof, and is provided with a scavengingport 58 from which air is scavenged to the outside is provided on the top panel thereof. Theair cooler 54 cools ejected air with high pressure increased by compression down to a desired temperature. Theair cooler 54 is installed between the scavengingport 58 and thecompressor 103. Furthermore, thefan 55 and thefan motor 56 that generate the flow of air from theair inlet 57 to the scavengingport 58 are installed between theair cooler 54 and thecompressor 101. Ejected air resulted from heat exchange with cooling air of thefan 55 is then supplied to the user side by theair cooler 54. - The compressor 103 (the same is true on the
compressors cooling jacket 2j to the side of thecompressor body 1 and thegear casing 3 and collect the lubricating oil after lubrication on the lower side of thecooling jacket 2j. This configuration is suited to cool lubricating oil in thecooling jacket 2j in thecompressor component 50. - Specifically, lubricating oil after lubrication of the gears, etc. absorbs heat of each part; therefore, lubricating oil collected on the lower side of the
cooling jacket 2j tends to have a higher temperature than that on the upper side. When thecompressor 101 is transversely placed, cooling air flowing upward from the bottom in the component from theair inlet 57 toward the scavengingport 58 is directly and much hit by the lower side of themotor housing 2c. That is, the upstream side of the cooling air directly hits the lower side of theelectric motor 2. - Accordingly, it is possible to achieve an effect of being able to achieve an effect of facilitating cooling of lubricating oil on the lower side of the relatively-high-
temperature cooling jacket 2j. - The embodiments of the present invention are described above; however, the present invention is not limited to the above-described configurations, and various configurations can be applied without departing from the scope of the invention, and the configuration of one embodiment can also be applied to that of another embodiment.
- For example, the cooling jacket 1j for cooling the
compressor body 1 inEmbodiment 2 can be applied to the other embodiments. Furthermore, the level of thepipings Embodiments 1 to 3. - Moreover, as feeding paths of lubricating oil, the
pipings 35a to 35f and 37a to 37e are provided outside the compressor; however, some or all of these can be formed, by a three-dimensional shaping machine or the like, as a flow path communicated with the inside such as thecompressor body 1, thegear casing 3, and themotor housing 2c. -
- 1
- Compressor body
- 1b
- Bearing
- 1j
- Cooling jacket
- 1s
- Shaft seal
- 2
- Electric motor
- 2b
- Bearing
- 2c
- Motor housing
- 2j
- Cooling jacket
- 2s
- Shaft seal
- 3
- Gear casing
- 4a
- Drive gear
- 4b
- Driven gear
- 5a, 5b
- Timing gear
- 6
- Oil pump
- 7
- Check valve
- 8
- Atmosphere communicating part
- 9
- Internal piping
- 10
- Lubricating oil feed piping
- 11
- Oil cooler
- 12
- Temperature control valve
- 20
- Air inlet
- 21
- Outlet
- 22
- Compression operation chamber
- 30a
- Male rotor
- 30b
- Female rotor
- 31
- Rotor shaft
- 32
- Motor shaft
- 35a, 35b, 35c, 35d, 35e, 35f, 35g
- Piping
- 37a, 37b, 37c, 37d, 37e, 37g
- Piping
- 39
- Oil inlet
- 49
- Outlet
- 50
- Compressor component
- 51
- Base
- 52
- Package panel
- 53
- Leg part
- 54
- Air cooler
- 55
- Fan
- 56
- Fan motor
- 57
- Air inlet
- 58
- Scavenging port
- 101, 102, 103, 104, 105
- Oilless screw compressor
Claims (14)
- An oilless compressor comprising:- a compressor body (1) having a rotor for compressing air,- a rotor shaft (31) for supporting the rotor and a bearing (1b) for rotatably supporting the rotor shaft (31);- an electric motor (2) configured to generate driving force for driving the compressor body (1);- at least one gear configured to transmit the driving force to the rotor shaft (31);- a lubricating oil piping (10) configured to feed lubricating oil to at least either the bearing (16) or the at least one gear; and- an oil pump (6) configured to pump the lubricating oil, whereinthe electric motor (2) includes a cooling jacket (2j) having an outlet (49) and an inlet (39) for circulating the lubricating oil into an internal flow path via the lubricating oil piping, thereby cooling the armature, characterized in that:
the cooling jacket (2j) is further adapted to provide an oil sump. - The oilless compressor according to Claim 1, wherein
the compressor body (1) includes a compressor-body cooling jacket in an outer circumferential direction of the rotor, the compressor-body cooling jacket (1j) having a flow path through which the lubricating oil is circulated into the internal flow path, thereby cooling the compressor body (1). - The oilless compressor according to Claim 2, wherein
the lubricating oil is circulated into the lubricating oil piping after having been circulated from the cooling jacket (2j) into the compressor-body cooling jacket (1j). - The oilless compressor according to Claim 1, wherein
the cooling jacket has a lubricating oil outlet on an upper side and a lubricating oil return port on a lower side thereof. - The oilless compressor according to Claim 4, wherein
a level of at least either the bearing or the gear is lower than a position of an oil level of lubricating oil in the cooling jacket (2j). - The oilless compressor according to Claim 4, wherein
of the lubricating oil piping, a lubricating oil piping through which lubricating oil is fed from the cooling jacket (2j) to at least either the bearing (1b) or the gear is installed on an upper side of the oilless compressor, thereby feeding the lubricating oil from above the bearing (1b) and the gear. - The oilless compressor according to Claim 4, wherein
of the lubricating oil piping, a lubricating oil piping through which lubricating oil is fed from the cooling jacket (2j) to at least either the bearing (1b) or the gear feeds the lubricating oil from above a level of a radial center of the bearing (1b) or the gear. - The oilless compressor according to Claim 1, further comprising:
an atmosphere communicating part communicated with outside air on an upper side of the cooling jacket (2j). - The oilless compressor according to Claim 1, wherein
the cooling jacket (2j) is divided into a pair of upper and lower parts, the upper cooling jacket having a lubricating oil outlet on an upper side thereof, the lower cooling jacket having a lubricating oil return port on a lower side thereof, and
the lubricating oil piping includes a piping through which lubricating oil of the lower cooling jacket (2j) is circulated back to the upper cooling jacket. - The oilless compressor according to Claim 1 or 9, wherein
the oil pump is installed at an opposite-output-shaft-side end of a rotation shaft of the electric motor (2), and is driven by rotary drive of the electric motor (2). - The oilless compressor according to Claim 1, wherein
an oil cooler (11) for cooling lubricating oil with air or water is installed on the lubricating oil piping. - The oilless compressor according to Claim 11, wherein
the lubricating oil piping includes:- a bypass piping connecting a piping on an upstream of an inlet of the oil cooler (11) to a piping on a downstream of an outlet of the oil cooler (11); and- a changeover valve that changes a flow path of the lubricating oil to the bypass piping or the oil cooler (11). - The oilless compressor according to Claim 1, wherein
a rotation shaft of the electric motor (2) and an axial direction of the rotor shaft are parallel to each other and same in horizontal position. - The oilless compressor according to Claim 1 or 2, wherein
a rotation shaft of the electric motor (2) and the rotor shaft are configured to be integral with each other.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2015034693 | 2015-02-25 | ||
PCT/JP2016/054047 WO2016136482A1 (en) | 2015-02-25 | 2016-02-12 | Oilless compressor |
Publications (3)
Publication Number | Publication Date |
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EP3263903A1 EP3263903A1 (en) | 2018-01-03 |
EP3263903A4 EP3263903A4 (en) | 2018-10-17 |
EP3263903B1 true EP3263903B1 (en) | 2020-11-04 |
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ID=56788464
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Application Number | Title | Priority Date | Filing Date |
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EP16755229.8A Active EP3263903B1 (en) | 2015-02-25 | 2016-02-12 | Oilless compressor |
Country Status (5)
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US (1) | US10550841B2 (en) |
EP (1) | EP3263903B1 (en) |
JP (1) | JP6491738B2 (en) |
CN (1) | CN107250547B (en) |
WO (1) | WO2016136482A1 (en) |
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JP6491738B2 (en) | 2019-03-27 |
EP3263903A4 (en) | 2018-10-17 |
US20180238329A1 (en) | 2018-08-23 |
CN107250547B (en) | 2019-01-11 |
WO2016136482A1 (en) | 2016-09-01 |
US10550841B2 (en) | 2020-02-04 |
JPWO2016136482A1 (en) | 2018-02-08 |
CN107250547A (en) | 2017-10-13 |
EP3263903A1 (en) | 2018-01-03 |
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